diff options
Diffstat (limited to 'cddl/contrib/opensolaris/lib/libdtrace/common/dt_pid.c')
| -rw-r--r-- | cddl/contrib/opensolaris/lib/libdtrace/common/dt_pid.c | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/cddl/contrib/opensolaris/lib/libdtrace/common/dt_pid.c b/cddl/contrib/opensolaris/lib/libdtrace/common/dt_pid.c index b145818..c865a2d 100644 --- a/cddl/contrib/opensolaris/lib/libdtrace/common/dt_pid.c +++ b/cddl/contrib/opensolaris/lib/libdtrace/common/dt_pid.c @@ -23,6 +23,9 @@ * Copyright 2010 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ +/* + * Copyright (c) 2013, Joyent, Inc. All rights reserved. + */ #include <assert.h> #include <strings.h> @@ -35,6 +38,7 @@ #endif #include <libgen.h> #include <stddef.h> +#include <sys/sysmacros.h> #include <dt_impl.h> #include <dt_program.h> @@ -43,6 +47,7 @@ #if !defined(sun) #include <libproc_compat.h> #endif +#include <dt_module.h> typedef struct dt_pid_probe { dtrace_hdl_t *dpp_dtp; @@ -827,3 +832,170 @@ dt_pid_create_probes_module(dtrace_hdl_t *dtp, dt_proc_t *dpr) return (ret); } + +/* + * libdtrace has a backroom deal with us to ask us for type information on + * behalf of pid provider probes when fasttrap doesn't return any type + * information. Instead we'll look up the module and see if there is type + * information available. However, if there is no type information available due + * to a lack of CTF data, then we want to make sure that DTrace still carries on + * in face of that. As such we don't have a meaningful exit code about failure. + * We emit information about why we failed to the dtrace debug log so someone + * can figure it out by asking nicely for DTRACE_DEBUG. + */ +void +dt_pid_get_types(dtrace_hdl_t *dtp, const dtrace_probedesc_t *pdp, + dtrace_argdesc_t *adp, int *nargs) +{ + dt_module_t *dmp; + ctf_file_t *fp; + ctf_funcinfo_t f; + ctf_id_t argv[32]; + GElf_Sym sym; +#if defined(sun) + prsyminfo_t si; +#else + void *si; +#endif + struct ps_prochandle *p; + int i, args; + char buf[DTRACE_ARGTYPELEN]; + const char *mptr; + char *eptr; + int ret = 0; + int argc = sizeof (argv) / sizeof (ctf_id_t); + Lmid_t lmid; + + /* Set up a potential outcome */ + args = *nargs; + *nargs = 0; + + /* + * If we don't have an entry or return probe then we can just stop right + * now as we don't have arguments for offset probes. + */ + if (strcmp(pdp->dtpd_name, "entry") != 0 && + strcmp(pdp->dtpd_name, "return") != 0) + return; + + dmp = dt_module_create(dtp, pdp->dtpd_provider); + if (dmp == NULL) { + dt_dprintf("failed to find module for %s\n", + pdp->dtpd_provider); + return; + } + if (dt_module_load(dtp, dmp) != 0) { + dt_dprintf("failed to load module for %s\n", + pdp->dtpd_provider); + return; + } + + /* + * We may be working with a module that doesn't have ctf. If that's the + * case then we just return now and move on with life. + */ + fp = dt_module_getctflib(dtp, dmp, pdp->dtpd_mod); + if (fp == NULL) { + dt_dprintf("no ctf container for %s\n", + pdp->dtpd_mod); + return; + } + p = dt_proc_grab(dtp, dmp->dm_pid, 0, PGRAB_RDONLY | PGRAB_FORCE); + if (p == NULL) { + dt_dprintf("failed to grab pid\n"); + return; + } + dt_proc_lock(dtp, p); + + /* + * Check to see if the D module has a link map ID and separate that out + * for properly interrogating libproc. + */ + if ((mptr = strchr(pdp->dtpd_mod, '`')) != NULL) { + if (strlen(pdp->dtpd_mod) < 3) { + dt_dprintf("found weird modname with linkmap, " + "aborting: %s\n", pdp->dtpd_mod); + goto out; + } + if (pdp->dtpd_mod[0] != 'L' || pdp->dtpd_mod[1] != 'M') { + dt_dprintf("missing leading 'LM', " + "aborting: %s\n", pdp->dtpd_mod); + goto out; + } + errno = 0; + lmid = strtol(pdp->dtpd_mod + 2, &eptr, 16); + if (errno == ERANGE || eptr != mptr) { + dt_dprintf("failed to parse out lmid, aborting: %s\n", + pdp->dtpd_mod); + goto out; + } + mptr++; + } else { + mptr = pdp->dtpd_mod; + lmid = 0; + } + + if (Pxlookup_by_name(p, lmid, mptr, pdp->dtpd_func, + &sym, &si) != 0) { + dt_dprintf("failed to find function %s in %s`%s\n", + pdp->dtpd_func, pdp->dtpd_provider, pdp->dtpd_mod); + goto out; + } +#if defined(sun) + if (ctf_func_info(fp, si.prs_id, &f) == CTF_ERR) { + dt_dprintf("failed to get ctf information for %s in %s`%s\n", + pdp->dtpd_func, pdp->dtpd_provider, pdp->dtpd_mod); + goto out; + } +#endif + + (void) snprintf(buf, sizeof (buf), "%s`%s", pdp->dtpd_provider, + pdp->dtpd_mod); + + if (strcmp(pdp->dtpd_name, "return") == 0) { + if (args < 2) + goto out; + + bzero(adp, sizeof (dtrace_argdesc_t)); + adp->dtargd_ndx = 0; + adp->dtargd_id = pdp->dtpd_id; + adp->dtargd_mapping = adp->dtargd_ndx; + /* + * We explicitly leave out the library here, we only care that + * it is some int. We are assuming that there is no ctf + * container in here that is lying about what an int is. + */ + (void) snprintf(adp->dtargd_native, DTRACE_ARGTYPELEN, + "user %s`%s", pdp->dtpd_provider, "int"); + adp++; + bzero(adp, sizeof (dtrace_argdesc_t)); + adp->dtargd_ndx = 1; + adp->dtargd_id = pdp->dtpd_id; + adp->dtargd_mapping = adp->dtargd_ndx; + ret = snprintf(adp->dtargd_native, DTRACE_ARGTYPELEN, + "userland "); + (void) ctf_type_qname(fp, f.ctc_return, adp->dtargd_native + + ret, DTRACE_ARGTYPELEN - ret, buf); + *nargs = 2; +#if defined(sun) + } else { + if (ctf_func_args(fp, si.prs_id, argc, argv) == CTF_ERR) + goto out; + + *nargs = MIN(args, f.ctc_argc); + for (i = 0; i < *nargs; i++, adp++) { + bzero(adp, sizeof (dtrace_argdesc_t)); + adp->dtargd_ndx = i; + adp->dtargd_id = pdp->dtpd_id; + adp->dtargd_mapping = adp->dtargd_ndx; + ret = snprintf(adp->dtargd_native, DTRACE_ARGTYPELEN, + "userland "); + (void) ctf_type_qname(fp, argv[i], adp->dtargd_native + + ret, DTRACE_ARGTYPELEN - ret, buf); + } +#endif + } +out: + dt_proc_unlock(dtp, p); + dt_proc_release(dtp, p); +} |
